Blue by U

I am currently running an A&A 2.85 blower pulley with 10% overdrive innovators west crank pulley. It is all 8 rib. I'm having quite a bit belt slip! Boost is peaking at about 16lbs at 6,000 rpm then dropping from there up to 7,000 rpm. I know 10 rib would be better, but for now I just want to get the most I can out of 8 rib. What blower pulley is everyone running to get max boost without slip? I was leaning towards 3.00 but not sure.this is on Z06. I figure my boost should be around 18 to 20 with this set up, but I understand that every car is different and that boost is not the most important factor, but I know I am having slip.
Thanks for any advice. I'm already running a direct drive.

Blue by U

Anybody? Ysi users, what size 8 rib blower pulley you running?

SquatchMachining

put on a 3" pulley with the correct belt and you will not have any issues. Or just bite the bullet and convert it to 10 rib and be done with it.

winters97gt

ECS Novi 2500, 10% overdrive here, 2.85 blower like you. No belt slip. Same step up ratios and essentially the same blower.

Blue by U

What belt you running?

Blue by U

Thanks.

winters97gt

Just a cheapo, nothing fancy. Autozone I believe.

Blue by U

Sorry, I meant what size, length? Thanks for the help.

realcanuk

YSI, 8 rib, 3.0 pulley with no slip to 7000 rpm, but running a flip drive also.

gotjuice?

I run the same setup as you, A&A, YSI, 2.85, 10%, Direct drive. Run up to 7100 rpm with no issues. Good luck going to a 10 rib. You cannot do it with the A&A bracket and run that size pulley. Are you running a dedicated belt for the blower? That may be you issue.

SquatchMachining

I run a a&a 10 rib setup with a modified tensioner and a 2.70 blower pulley / 8" crank pulley. DP direct drive cut for 6 rib a/c drive opposed to the original 4 rib. Logs with this setup show no slip and I get very little belt dust. I run the green Kevlar belts, properly aligned they last a long long time, going on 3 years and over 15000 miles.

gotjuice?

I spoke with Josh at A&A at length and he said I could not run the 10 rib with a smaller pulley on the newest bracket design. The older bracket tensioner would not hold up. I had already purchased the IW balancer and was really pissed to hear about this. Can you pm some details of what you did to make it work and with what A&A bracket design. I already have the DP direct drive with 6 rib C5 bracket a/c setup.

Silver Bullet C6

I am getting 15.5/ 16 psi also on a built motor 427, Mast 305 heads. Same pulleys as you with a Cartek direct drive. Taylor at Dallas Performance said he didn't see signs of belt slip.

neutron82

I just bought the newest design a&a procharger bracket set up for 10 rib, I would assume their vortech brackets are virtually the same as far as the way they operate... I also got the heavy duty tensioner, it looks the same as the standard tensioner but they weld a plate on the back and install a bolt through the middle

realcanuk

I am getting 19.5 lbs with the 3 inch pulley and 8% overdrive damper.

SquatchMachining

Yup, that's how I modified my tensioner as well. Just reinforced it and took all the end play out of it. I'm using the newest version of their Vortech bracket, same one that's been around for a couple years. No issues at all, it's been pretty good to me. It was originally a 8 rib setup. Swap to 10 rib was as simple as making my own stand offs and ordering the idler pulleys from A&A. Pretty simple stuff.

Blue by U

Yes, I'm running a dedicated belt for blower. What length of belt do you run?

Blue by U

That's what I am seeing but there is slip. Boost is peaking at 6,000 rpm and falling down to 15 at 7,000. Got plenty of belt dust, but belt is running true.

realcanuk

You might try one of those A&A pulleys with the grooves cut in them, if you are not already. I am using that and get no slip as mentioned.
With my 3.0 I am using belt KO80537HD. It would be the same for the 2.85 on my car.

The pulley in this pic is the 2.85 with grooves, although I decided to use the 3.0 in the end.

Blue by U

Thanks. That's the 2.85 that I'm running. Same length belt. I tried next shorter, but couldn't get it to go on. I'm running A&A pulley with ECS BRACKETS. So you are seeing 19.5 lbs with the 3.00 not the 2.85?